A cloud of vapor (usually from a juul or vape) that is of extrordanary size and shape.
Woah! Look at that phat cloud.

Alex took his drop out during bio and ripped a phat cloud.
by nice jewish babe November 11, 2018
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A big cloud from a vape; usually from a mod, but can be used with other vapes such as Juuls, drops, ect.
1: here hit my mod
2: okay *hits it*
3: damn bro that's a phat cloud
by Stonersince04 December 2, 2018
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